# Devil's staircase structures in $\varphi_{0}$ junction

## TL;DR

This paper investigates the emergence of fractional subharmonic steps in the IV-characteristics of a $\

## Contribution

It reveals the origin of subharmonic steps in $\

## Key findings

- Subharmonic steps follow a continued fraction pattern.
- Steps are caused by magnetic moment precession locking.
- External radiation induces fractional steps in the junction.

## Abstract

The superconductor-ferromagnet-superconductor $\varphi_{0}$ junction provides a direct coupling between Josephson phase and magnetic moment of ferromagnetic barrier. We demonstrate an appearance of additional fractional subharmonic steps in the IV-characteristics of $\varphi_{0}$ junction under external electromagnetic radiation due to spin-orbit coupling. An origin of subharmonic steps is related to the locking of magnetic moment precession to the Josephson oscillations. We prove that the positions of those steps follow a continued fraction algorithm.